Monsoon variability and deep oceanic circulation in the western Equatorial Pacific over the last climatic cycle; insights from sedimentary magnetic properties and sortable silt
Monsoon variability and deep oceanic circulation in the western Equatorial Pacific over the last climatic cycle; insights from sedimentary magnetic properties and sortable silt
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DOI：
10.1029/2010pa001980
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
C. Kissel;C. Laj;M. Kienast;T. Bolliet;A. Holbourn;P. Hill;W. Kuhnt;P. Braconnot
中科院分区：
文献类型：
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作者：
C. Kissel;C. Laj;M. Kienast;T. Bolliet;A. Holbourn;P. Hill;W. Kuhnt;P. Braconnot
磁性和粒度特性的沉积物芯位于赤道西太平洋，离开菲律宾棉兰老岛的东南端，在努力重建过去的东亚季风和深海环流的变化，在过去的160 kyrs。磁性颗粒的沉积浓度，解释为反映过去的变化，从棉兰老岛径流，变化几乎与北方半球日照反相。这表明，降水量较低，在赤道西太平洋地区在北方日照最大值，从而证实了模型的结果，显示相反的趋势，在陆地和海洋领域之间的降水。无机沉积物部分的粒度分布的变化，记录的可分选粉砂的平均粒径和磁性粒度，提供了一个监测的变化，沉积物改造底流。该代理的底流强度和底栖三角洲（18）O记录从同一网站的密切相关性意味着深水流，最有可能的南极中层水（AAIW），和全球气候之间的紧密耦合。
Magnetic and grain size properties of a sediment core located in the western equatorial Pacific, off the southeastern tip of the Philippine island of Mindanao, are presented in an effort to reconstruct past changes in the East Asian Monsoon and deep ocean circulation during the last 160 kyrs. The sedimentary concentration of magnetic particles, interpreted to reflect past changes in runoff from Mindanao, varies almost in antiphase with Northern Hemisphere insolation. This suggests that precipitation was lower in the western equatorial Pacific region during boreal insolation maxima and thus corroborates model results showing opposing trends in precipitation between land and the marine realm there. Variations in the grain size distribution of the inorganic sediment fraction, as recorded by both the sortable silt mean size and the magnetic grain size, provide a monitor of changes in sediment reworking by bottom currents. The close correlation of this proxy of bottom current strength and the benthic delta(18)O record from the same site implies a tight coupling between deep water flow, most likely Antarctic Intermediate Water (AAIW), and global climate.